It is, however, known to occur during rapideyemovement sleep, which is characterized by brain activity patterns that resemble wakefulness and which has been documented with polysomnography and other sleep tests.

The basic mechanism for REM sleep paralysis is found in the brainstem, the part of the brain that connects the spinal chord to the cerebral hemispheres and that consists of the pons, midbrain, and the medulla oblongata.

Sleep, rapideyemovement: REM sleep is the portion of sleep when there are rapideyemovements (REMs).

REM sleep is characterized by a number of other features including rapid, low-voltage brain waves detectable on the electroencephalographic (EEG) recording, irregular breathing and heart rate and involuntary muscle jerks.

During NREM, the brain waves on the EEG are typically slow and of high voltage, the breathing and heart rate are slow and regular, the blood pressure is low, and the sleeper is relatively still.

A polysomnograph is a test of sleep cycles and stages through the use of continuous recordings of brain waves (EEG), electrical activity of muscles, eyemovement (electrooculogram), respiratory rate, blood pressure, blood oxygen saturation, and heart rhythm and direct observation of the person during sleep.

There are two states of sleep: non-rapid eyemovement (NREM) sleep and rapideyemovement (REM) sleep.

Initially, Aserinsky was intent on studying slow, rolling eyemovements in infants while they slept in the hope he could uncover a relationship between eye activity and sleep depth.

The eyemovement bursts seemed to be associated with a lack of body movement.

In order to investigate the possibility that these periods of rapideyemovementsleep were in fact related to dream, Aserinsky and Kleitman, and later Bill Dement awakened subjects in the midst of the REM periods.

A polysomnograph is a test of sleep cycles and stages through the use of continuous recordings of brain waves (EEG), electrical activity of muscles, eyemovement (electrooculogram), breathing rate, blood pressure, blood oxygen saturation, and heart rhythm and direct observation of the person during sleep.

EMDR is a therapeutic technique in which the patient moves his or her eyes back and forth, hither and thither, while concentrating on "the problem." The therapist waves a stick or light in front of the patient and the patient is supposed to follow the moving stick or light with his or her eyes.

She admits that eyemovement is not essential to eyemovement desensitization processing, and claims attacks on her are ad hominem and without merit.

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